There is no current standard for the amount of flux that should be applied to a board. Current standards focus on what the result of a process should be, not how the process should be performed. So, the standard tells you that you need a procedure defining flux application and coverage.

That being said, your boss' approach is not far from one that you might consider as you move forward in developing your own process specification. Wave, foam and spray fluxers all will be similar, but different. First step: consider contacting the rep for your flux supplier. Your flux supplier has already plowed this ground.